Long-term changes in microbial water quality indicators in a hydro-power plant reservoir: The role of natural factors and socio-economic changes

The sublittoral macrobenthic invertebrate populations of the Upper Clyde Estuary are described. The estuary has a long history of organic pollution. The long term changes in species composition, faunal density and dominance patterns between 1974 and 1980 are presented. The fauna is dominated by brackish, pollution tolerant oligochaetes and polychaetes. Fluctuations in populations can be related to both seasonal variation in environmental conditions and long term improvements in water quality through a reduction in pollution loading to the estuary.

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The consequences for stream water quality of long-term changes in landscape patterns: Implications for land use management and policies

Land Use Policy ◽

10.1016/j.landusepol.2021.105679 ◽

2021 ◽

Vol 109 ◽

pp. 105679

Author(s):

António Carlos Pinheiro Fernandes ◽

Lisa Maria de Oliveira Martins ◽

Fernando António Leal Pacheco ◽

Luís Filipe Sanches Fernandes

Keyword(s):

Water Quality ◽

Land Use ◽

Stream Water ◽

Landscape Patterns ◽

Land Use Management ◽

Stream Water Quality ◽

Long Term Changes

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Long-term changes in water quality and ecological status of lakes in the Wielkopolska National Park and its buffer zone with special reference to effectiveness of the lakes’ protection

Oceanological and Hydrobiological Studies ◽

10.1515/ohs-2016-0044 ◽

2016 ◽

Vol 45 (4) ◽

Cited By ~ 1

Author(s):

Agnieszka E. Ławniczak

Keyword(s):

Water Quality ◽

Catchment Area ◽

National Park ◽

Ecological Status ◽

Buffer Zone ◽

Field Studies ◽

Long Term Changes ◽

Protection Strategies

AbstractThis paper evaluates water quality and ecological status of lakes located in the Wielkopolska National Park and its buffer zone. Changes in water quality were analyzed from 1974 to 2012 in order to assess the effectiveness of the protection strategies implemented on the studied lakes since 1957, i.e. the date when the park was established. The ecological status of the lakes was assessed with the use of macrophytes as well as hydromorphological and physicochemical analyses performed in 2012. Changes in water quality of the studied lakes within the last 40 years were analyzed based on available published and unpublished data, as well as field studies. All water bodies are characterized by advanced eutrophication. However, evaluation of the ecological status showed good status of the charophyte-dominated lakes, i.e. Lake Wielkowiejskie and Lake Budzyńskie. Lack of significant differences in physicochemical water qualities between the park and its buffer zone indicated that measures implemented to protect the water, particularly in the park, are ineffective. This study shows that more radical conservation measures are necessary to protect and improve the water quality, not only in WPN and its buffer zone but also in the whole catchment area.

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Long-term Changes of Physicochemical Water Quality in Lake Youngrang, Korea

Korean Journal of Ecology and Environment ◽

10.11614/ksl.2017.50.1.169 ◽

2017 ◽

Vol 50 (1) ◽

pp. 169-185 ◽

Cited By ~ 1

Author(s):

Bal Dev Bhattrai ◽

Sungjin Kwak ◽

Kwansoon Choi ◽

Woomyung Heo

Keyword(s):

Water Quality ◽

Long Term Changes

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Interannual and long-term changes in the trophic state of a multibasin lake: effects of morphology, climate, winter aeration, and beaver activity

Canadian Journal of Fisheries and Aquatic Sciences ◽

10.1139/cjfas-2015-0249 ◽

2016 ◽

Vol 73 (3) ◽

pp. 445-460 ◽

Cited By ~ 1

Author(s):

Dale M. Robertson ◽

William J. Rose ◽

Paul C. Reneau

Keyword(s):

Water Quality ◽

Trophic State ◽

Secchi Depth ◽

Climatic Changes ◽

Main Flow ◽

Temperature And Precipitation ◽

Air Temperatures ◽

Long Term Changes ◽

P Sources

Little St. Germain Lake (LSG), a relatively pristine multibasin lake in Wisconsin, USA, was examined to determine how morphologic (internal), climatic (external), anthropogenic (winter aeration), and natural (beaver activity) factors affect the trophic state (phosphorus, P; chlorophyll, CHL; and Secchi depth, SD) of each of its basins. Basins intercepting the main flow and external P sources had highest P and CHL and shallowest SD. Internal loading in shallow, polymictic basins caused P and CHL to increase and SD to decrease as summer progressed. Winter aeration used to eliminate winterkill increased summer internal P loading and decreased water quality, while reductions in upstream beaver impoundments had little effect on water quality. Variations in air temperature and precipitation affected each basin differently. Warmer air temperatures increased productivity throughout the lake and decreased clarity in less eutrophic basins. Increased precipitation increased P in the basins intercepting the main flow but had little effect on the isolated deep West Bay. These relations are used to project effects of future climatic changes on LSG and other temperate lakes.

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TGF-β1-Induced Long-Term Changes in Neuronal Excitability in Aplysia Sensory Neurons Depend on MAPK

Journal of Neurophysiology ◽

10.1152/jn.00770.2005 ◽

2006 ◽

Vol 95 (5) ◽

pp. 3286-3290 ◽

Cited By ~ 27

Author(s):

Jeannie Chin ◽

Rong-Yu Liu ◽

Leonard J. Cleary ◽

Arnold Eskin ◽

John H. Byrne

Keyword(s):

Sensory Neuron ◽

Transforming Growth Factor Beta ◽

Neuronal Excitability ◽

Transforming Growth Factor ◽

Critical Role ◽

Camp Response Element Binding ◽

Long Term Changes ◽

Tgf Β1

Transforming growth factor beta-1 (TGF-β1) plays important roles in the early development of the nervous system and has been implicated in neuronal plasticity in adult organisms. It induces long-term increases in sensory neuron excitability in Aplysia as well as a long-term enhancement of synaptic efficacy at sensorimotor synapses. In addition, TGF-β1 acutely regulates synapsin phosphorylation and reduces synaptic depression induced by low-frequency stimuli. Because of the critical role of MAPK in other forms of long-term plasticity in Aplysia, we examined the role of MAPK in TGF-β1-induced long-term changes in neuronal excitability. Prolonged (6 h) exposure to TGF-β1 induced long-term increases in excitability. We confirmed this finding and now report that exposure to TGF-β1 was sufficient to activate MAPK and increase nuclear levels of active MAPK. Moreover, TGF-β1 enhanced phosphorylation of the Aplysia transcriptional activator cAMP response element binding protein (CREB)1, a homologue to vertebrate CREB. Both the TGF-β1-induced long-term changes in neuronal excitability and the phosphorylation of CREB1 were blocked in the presence of an inhibitor of the MAPK cascade, confirming a role for MAPK in long-term modulation of sensory neuron function.

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